Louis Vuitton help

I have a delightful pm and I was wanting to buy a strap for it but I'm not forsure which one would work. I watched youtube videos and some straps are to small to clasp the loop. I saw the 16mm and wondered if anyone knew if that would work because the only one I've really saw anyone that worked on video is keepall and apparently you cant just buy that cause I didn't see if on the website. I prefer to buy new but if I have to I'll find the keepall and get that.